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1 2001

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Recent progress in the development of nanophase rare earth magnets

Davies H. A., Harland C. L., Betacourt J. I., Wang Z. C.

Advances in Materials Science

2001

Vol. 1, nr 1(1)

7-18

Nanocrystalline melt-spun rare earth - iron - boron alloys based on Pr and on Nd-Pr mixtures have been studied. Their magnetic properties are compared with those of corresponding alloy ribbons based on Nd. The Pr containing alloys have gener-ally higher coercivity than their Nd counterparts because of the higher anisotropy constant of the Pr2Fe14B phase. Co substitution for Fe increases the Curie tem-perature for both the Pr and Nd-Pr nanophase alloys. excellent magnetic property combinations were achieved for single phase Pr12(Fe100-xCox)82B6 (x = 0 - 20) alloys, processed by overquenching and devitrification annealing. Addition of 1 at % Zr as a grain refiner resulted in increased coercivity and maximum energy product of NdPrFeB alloys for the whole range of RE contents studied (8 - 12 at %).